著者

松田 篤志 西島 敏隆 深見 公雄 足立 真佐雄 Atsushi Matsuda Toshitaka Nishijima Kimio Fukami Masao Adachi 高知大学農学部栽培漁業学科:(現)熊本市役所 高知大学農学部栽培漁業学科 高知大学農学部栽培漁業学科 高知大学農学部栽培漁業学科 Department of Aquaculture Faculty of Agriculture Kochi University:(Present address)Kumamoto City Office Department of Aquaculture Faculty of Agriculture Kochi University Department of Aquaculture Faculty of Agriculture Kochi University Department of Aquaculture Faculty of Agriculture Kochi University

出版者

The Japanese Society of Fisheries Science

雑誌

日本水産学会誌 = Bulletin of the Japanese Society of Scientific Fisheries (ISSN:00215392)

巻号頁・発行日

vol.67, no.4, pp.658-663, 2001-07-15

参考文献数

32

被引用文献数

2

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A. catenellaの増殖に及ぼすB群ビタミンの影響をバッチ培養系において調べた。本藻はB群ビタミンのうちビタミンB_<12>を増殖に必須に要求し, 増殖のB_<12>半飽和定数(Kμ)は0.22ng/L, 最大比増殖速度(μ'm)は0.55 day^<-1>, 最小細胞内B_<12>含量(q_0)は0.65fg/cell, 単位細胞体積当たりのB_<12>含量は27分子/μm^3と算出された。本藻は, 他の栄養物質が充足されている場合, 富栄養化の進んだ沿岸・内湾域のようにB_<12>供給量が多い海域では最大に近い比増殖速度で増殖できると考えられた。また, Kμ, μ'mを他の赤潮プランクトンと比較した結果, 本藻は低B_<12>濃度下で一部の赤潮プランクトンよりも優位に増殖できると推察された。Physiological growth characteristics of Alexandrium catenella (Whedon et Kofoid) Balech, toxic dinoflagellate, were examined in axenic, batch cultures with specific reference to B group vitamin requirements. A. catenella required essentially vitamin B_<12> among the B group vitamins for their growth. It was found that growth rates and final cell yields were dependent on the vitamin B_<12> concentrations in the media. Under the conditions of our batch culture experiments, the half-saturation constant for growth of vitamin B_<12>(Kμ) and maximum growth rate (μ'm) were 0.22ng/L and 0.55 day^<-1>, respectively. The minimum cell quota of vitamin B_<12> was estimated at 0.65 fg/cell or 27 molecules/(μm)^3 of the cell volume. In this experiment, A. catenella could grow at almost a maximum growth rate at high vitamin B_<12> levels of eutrophied coastal waters. The comparison of Kμ and μ'm between A. catenella and other red-tide species suggests that this organism can win competition with some red-tide species under low B_<12> concentrations.